package com.wythe.mall.adapter;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;

import com.wythe.mall.R;
import com.wythe.mall.activity.LoginActivity;
import com.wythe.mall.utils.GotoActivity;
import com.wythe.mall.utils.UserManager;

import java.util.List;

public class FragmentTabAdapter implements RadioGroup.OnCheckedChangeListener {
    private List<Fragment> fragments; // 一个tab页面对应一个Fragment
    private RadioGroup rgs; // 用于切换tab
    private FragmentActivity fragmentActivity; // Fragment所属的Activity
    private int fragmentContentId; // Activity中所要被替换的区域的id
    private boolean animation = false;//切换时，是否需要动画

    private int currentTab; // 当前Tab页面索引

    public FragmentTabAdapter(FragmentActivity fragmentActivity, List<Fragment> fragments, int fragmentContentId, RadioGroup rgs) {
        this.fragments = fragments;
        this.rgs = rgs;
        this.fragmentActivity = fragmentActivity;
        this.fragmentContentId = fragmentContentId;

        // 默认显示第一页
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        ft.add(fragmentContentId, fragments.get(0));
        ft.commit();

        rgs.setOnCheckedChangeListener(this);


    }

    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {

        for (int i = 0; i < rgs.getChildCount(); i++) {

            if (rgs.getChildAt(i).getId() == checkedId) {
                if (i == 2 || i == 3) {
                    if (!UserManager.getInstance().isLogin()) {
                        GotoActivity.gotoActiviy(fragmentActivity, LoginActivity.class);
                        return;
                    }
                }
                Fragment fragment = fragments.get(i);
                FragmentTransaction ft = obtainFragmentTransaction(i);

                getCurrentFragment().onPause(); // 暂停当前tab
//                getCurrentFragment().onStop(); // 暂停当前tab

                if (fragment.isAdded()) {
//                    fragment.onStart(); // 启动目标tab的onStart()
                    fragment.onResume(); // 启动目标tab的onResume()
                } else {
                    ft.add(fragmentContentId, fragment);
                }

                showTab(i); // 显示目标tab
                ft.commit();
//                // 如果设置了切换tab额外功能功能接口
//                if (null != onRgsExtraCheckedChangedListener) {
//                    onRgsExtraCheckedChangedListener.OnRgsExtraCheckedChanged(radioGroup, checkedId, i);
//                }

            }
        }

    }

    /**
     * 切换tab
     *
     * @param idx
     */
    public void showTab(int idx) {

        for (int i = 0; i < fragments.size(); i++) {
            Fragment fragment = fragments.get(i);
            FragmentTransaction ft = obtainFragmentTransaction(idx);

            if (idx == i) {
                ft.show(fragment);
            } else {
                ft.hide(fragment);
            }
            ft.commit();
        }
        currentTab = idx; // 更新目标tab为当前tab
    }

    /**
     * 获取一个带动画的FragmentTransaction
     *
     * @param index
     * @return
     */
    private FragmentTransaction obtainFragmentTransaction(int index) {
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        // 设置切换动画
        if (animation) {
            if (index > currentTab) {
                ft.setCustomAnimations(R.anim.slide_left_in, R.anim.slide_left_out);
            } else {
                ft.setCustomAnimations(R.anim.slide_right_in, R.anim.slide_right_out);
            }
        }
        return ft;
    }

    public int getCurrentTab() {
        return currentTab;
    }

    public Fragment getCurrentFragment() {
        return fragments.get(currentTab);
    }


    public boolean isAnimation() {
        return animation;
    }

    public void setAnimation(boolean animation) {
        this.animation = animation;
    }
}

